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wayland/tests/connection-test.c
Fergus Dall e5c3ac9bcd connection-test: Pad out strings with null bytes 
The connection_demarshal test writes a 10 byte string into a wayland message,
but doesn't pad it out to a four byte boundary. This leads to the last 32-bit
word of the message being partially uninitialized, which triggers an msan
violation when the message is written to the socket.

Signed-off-by: Fergus Dall <sidereal@google.com>
2021-07-22 22:27:45 +00:00

862 lines
22 KiB
C
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/*
* Copyright © 2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <sys/socket.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <poll.h>
#include "wayland-private.h"
#include "test-runner.h"
#include "test-compositor.h"
static const char message[] = "Hello, world";
static struct wl_connection *
setup(int *s)
{
struct wl_connection *connection;
assert(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, s) == 0);
connection = wl_connection_create(s[0]);
assert(connection);
return connection;
}
TEST(connection_create)
{
struct wl_connection *connection;
int s[2];
connection = setup(s);
wl_connection_destroy(connection);
close(s[0]);
close(s[1]);
}
TEST(connection_write)
{
struct wl_connection *connection;
int s[2];
char buffer[64];
connection = setup(s);
assert(wl_connection_write(connection, message, sizeof message) == 0);
assert(wl_connection_flush(connection) == sizeof message);
assert(read(s[1], buffer, sizeof buffer) == sizeof message);
assert(memcmp(message, buffer, sizeof message) == 0);
wl_connection_destroy(connection);
close(s[0]);
close(s[1]);
}
TEST(connection_data)
{
struct wl_connection *connection;
int s[2];
char buffer[64];
connection = setup(s);
assert(write(s[1], message, sizeof message) == sizeof message);
assert(wl_connection_read(connection) == sizeof message);
wl_connection_copy(connection, buffer, sizeof message);
assert(memcmp(message, buffer, sizeof message) == 0);
wl_connection_consume(connection, sizeof message);
wl_connection_destroy(connection);
close(s[0]);
close(s[1]);
}
TEST(connection_queue)
{
struct wl_connection *connection;
int s[2];
char buffer[64];
connection = setup(s);
/* Test that wl_connection_queue() puts data in the output
* buffer without flush it. Verify that the data did get in
* the buffer by writing another message and making sure that
* we receive the two messages on the other fd. */
assert(wl_connection_queue(connection, message, sizeof message) == 0);
assert(wl_connection_flush(connection) == 0);
assert(wl_connection_write(connection, message, sizeof message) == 0);
assert(wl_connection_flush(connection) == 2 * sizeof message);
assert(read(s[1], buffer, sizeof buffer) == 2 * sizeof message);
assert(memcmp(message, buffer, sizeof message) == 0);
assert(memcmp(message, buffer + sizeof message, sizeof message) == 0);
wl_connection_destroy(connection);
close(s[0]);
close(s[1]);
}
static void
va_list_wrapper(const char *signature, union wl_argument *args, int count, ...)
{
va_list ap;
va_start(ap, count);
wl_argument_from_va_list(signature, args, count, ap);
va_end(ap);
}
TEST(argument_from_va_list)
{
union wl_argument args[WL_CLOSURE_MAX_ARGS];
struct wl_object fake_object, fake_new_object;
struct wl_array fake_array;
va_list_wrapper("i", args, 1, 100);
assert(args[0].i == 100);
va_list_wrapper("is", args, 2, 101, "value");
assert(args[0].i == 101);
assert(strcmp(args[1].s, "value") == 0);
va_list_wrapper("?iuf?sonah", args, 8,
102, 103, wl_fixed_from_int(104), "value",
&fake_object, &fake_new_object, &fake_array, 106);
assert(args[0].i == 102);
assert(args[1].u == 103);
assert(args[2].f == wl_fixed_from_int(104));
assert(strcmp(args[3].s, "value") == 0);
assert(args[4].o == &fake_object);
assert(args[5].o == &fake_new_object);
assert(args[6].a == &fake_array);
assert(args[7].h == 106);
}
struct marshal_data {
struct wl_connection *read_connection;
struct wl_connection *write_connection;
int s[2];
uint32_t buffer[10];
union {
uint32_t u;
int32_t i;
const char *s;
int h;
} value;
};
static void
setup_marshal_data(struct marshal_data *data)
{
assert(socketpair(AF_UNIX,
SOCK_STREAM | SOCK_CLOEXEC, 0, data->s) == 0);
data->read_connection = wl_connection_create(data->s[0]);
assert(data->read_connection);
data->write_connection = wl_connection_create(data->s[1]);
assert(data->write_connection);
}
static void
release_marshal_data(struct marshal_data *data)
{
close(wl_connection_destroy(data->read_connection));
close(wl_connection_destroy(data->write_connection));
}
static void
marshal(struct marshal_data *data, const char *format, int size, ...)
{
struct wl_closure *closure;
static const uint32_t opcode = 4444;
static struct wl_object sender = { NULL, NULL, 1234 };
struct wl_message message = { "test", format, NULL };
va_list ap;
va_start(ap, size);
closure = wl_closure_vmarshal(&sender, opcode, ap, &message);
va_end(ap);
assert(closure);
assert(wl_closure_send(closure, data->write_connection) == 0);
wl_closure_destroy(closure);
assert(wl_connection_flush(data->write_connection) == size);
assert(read(data->s[0], data->buffer, sizeof data->buffer) == size);
assert(data->buffer[0] == sender.id);
assert(data->buffer[1] == (opcode | (size << 16)));
}
TEST(connection_marshal)
{
struct marshal_data data;
struct wl_object object;
struct wl_array array;
static const char text[] = "curry";
setup_marshal_data(&data);
marshal(&data, "i", 12, 42);
assert(data.buffer[2] == 42);
marshal(&data, "u", 12, 55);
assert(data.buffer[2] == 55);
marshal(&data, "s", 20, "frappo");
assert(data.buffer[2] == 7);
assert(strcmp((char *) &data.buffer[3], "frappo") == 0);
object.id = 557799;
marshal(&data, "o", 12, &object);
assert(data.buffer[2] == object.id);
marshal(&data, "n", 12, &object);
assert(data.buffer[2] == object.id);
marshal(&data, "?n", 12, NULL);
assert(data.buffer[2] == 0);
array.data = (void *) text;
array.size = sizeof text;
marshal(&data, "a", 20, &array);
assert(data.buffer[2] == array.size);
assert(memcmp(&data.buffer[3], text, array.size) == 0);
release_marshal_data(&data);
}
static void
expected_fail_marshal(int expected_error, const char *format, ...)
{
struct wl_closure *closure;
static const uint32_t opcode = 4444;
static const struct wl_interface test_interface = {
.name = "test_object"
};
static struct wl_object sender = { 0 };
struct wl_message message = { "test", format, NULL };
sender.interface = &test_interface;
sender.id = 1234;
va_list ap;
va_start(ap, format);
closure = wl_closure_vmarshal(&sender, opcode, ap, &message);
va_end(ap);
assert(closure == NULL);
assert(errno == expected_error);
}
static void
expected_fail_marshal_send(struct marshal_data *data, int expected_error,
const char *format, ...)
{
struct wl_closure *closure;
static const uint32_t opcode = 4444;
static struct wl_object sender = { NULL, NULL, 1234 };
struct wl_message message = { "test", format, NULL };
va_list ap;
va_start(ap, format);
closure = wl_closure_vmarshal(&sender, opcode, ap, &message);
va_end(ap);
assert(closure);
assert(wl_closure_send(closure, data->write_connection) < 0);
assert(errno == expected_error);
wl_closure_destroy(closure);
}
TEST(connection_marshal_nullables)
{
struct marshal_data data;
struct wl_object object;
struct wl_array array;
const char text[] = "curry";
setup_marshal_data(&data);
expected_fail_marshal(EINVAL, "o", NULL);
expected_fail_marshal(EINVAL, "s", NULL);
expected_fail_marshal(EINVAL, "a", NULL);
marshal(&data, "?o", 12, NULL);
assert(data.buffer[2] == 0);
marshal(&data, "?a", 12, NULL);
assert(data.buffer[2] == 0);
marshal(&data, "?s", 12, NULL);
assert(data.buffer[2] == 0);
object.id = 55293;
marshal(&data, "?o", 12, &object);
assert(data.buffer[2] == object.id);
array.data = (void *) text;
array.size = sizeof text;
marshal(&data, "?a", 20, &array);
assert(data.buffer[2] == array.size);
assert(memcmp(&data.buffer[3], text, array.size) == 0);
marshal(&data, "?s", 20, text);
assert(data.buffer[2] == sizeof text);
assert(strcmp((char *) &data.buffer[3], text) == 0);
release_marshal_data(&data);
}
static void
validate_demarshal_u(struct marshal_data *data,
struct wl_object *object, uint32_t u)
{
assert(data->value.u == u);
}
static void
validate_demarshal_i(struct marshal_data *data,
struct wl_object *object, int32_t i)
{
assert(data->value.i == i);
}
static void
validate_demarshal_s(struct marshal_data *data,
struct wl_object *object, const char *s)
{
if (data->value.s != NULL)
assert(strcmp(data->value.s, s) == 0);
else
assert(s == NULL);
}
static void
validate_demarshal_h(struct marshal_data *data,
struct wl_object *object, int fd)
{
struct stat buf1, buf2;
assert(fd != data->value.h);
fstat(fd, &buf1);
fstat(data->value.h, &buf2);
assert(buf1.st_dev == buf2.st_dev);
assert(buf1.st_ino == buf2.st_ino);
close(fd);
close(data->value.h);
}
static void
validate_demarshal_f(struct marshal_data *data,
struct wl_object *object, wl_fixed_t f)
{
assert(data->value.i == f);
}
static void
demarshal(struct marshal_data *data, const char *format,
uint32_t *msg, void (*func)(void))
{
struct wl_message message = { "test", format, NULL };
struct wl_closure *closure;
struct wl_map objects;
struct wl_object object = { NULL, &func, 0 };
int size = msg[1] >> 16;
assert(write(data->s[1], msg, size) == size);
assert(wl_connection_read(data->read_connection) == size);
wl_map_init(&objects, WL_MAP_SERVER_SIDE);
object.id = msg[0];
closure = wl_connection_demarshal(data->read_connection,
size, &objects, &message);
assert(closure);
wl_closure_invoke(closure, WL_CLOSURE_INVOKE_SERVER, &object, 0, data);
wl_closure_destroy(closure);
}
TEST(connection_demarshal)
{
struct marshal_data data;
uint32_t msg[10];
setup_marshal_data(&data);
data.value.u = 8000;
msg[0] = 400200; /* object id */
msg[1] = 12 << 16; /* size = 12, opcode = 0 */
msg[2] = data.value.u;
demarshal(&data, "u", msg, (void *) validate_demarshal_u);
data.value.i = -557799;
msg[0] = 400200;
msg[1] = 12 << 16;
msg[2] = data.value.i;
demarshal(&data, "i", msg, (void *) validate_demarshal_i);
data.value.s = "superdude";
msg[0] = 400200;
msg[1] = 24 << 16;
msg[2] = 10;
msg[3 + msg[2]/4] = 0;
memcpy(&msg[3], data.value.s, msg[2]);
demarshal(&data, "s", msg, (void *) validate_demarshal_s);
data.value.s = "superdude";
msg[0] = 400200;
msg[1] = 24 << 16;
msg[2] = 10;
msg[3 + msg[2]/4] = 0;
memcpy(&msg[3], data.value.s, msg[2]);
demarshal(&data, "?s", msg, (void *) validate_demarshal_s);
data.value.i = wl_fixed_from_double(-90000.2390);
msg[0] = 400200;
msg[1] = 12 << 16;
msg[2] = data.value.i;
demarshal(&data, "f", msg, (void *) validate_demarshal_f);
data.value.s = NULL;
msg[0] = 400200;
msg[1] = 12 << 16;
msg[2] = 0;
demarshal(&data, "?s", msg, (void *) validate_demarshal_s);
release_marshal_data(&data);
}
static void
marshal_demarshal(struct marshal_data *data,
void (*func)(void), int size, const char *format, ...)
{
struct wl_closure *closure;
static const int opcode = 4444;
static struct wl_object sender = { NULL, NULL, 1234 };
struct wl_message message = { "test", format, NULL };
struct wl_map objects;
struct wl_object object = { NULL, &func, 0 };
va_list ap;
uint32_t msg[1] = { 1234 };
va_start(ap, format);
closure = wl_closure_vmarshal(&sender, opcode, ap, &message);
va_end(ap);
assert(closure);
assert(wl_closure_send(closure, data->write_connection) == 0);
wl_closure_destroy(closure);
assert(wl_connection_flush(data->write_connection) == size);
assert(wl_connection_read(data->read_connection) == size);
wl_map_init(&objects, WL_MAP_SERVER_SIDE);
object.id = msg[0];
closure = wl_connection_demarshal(data->read_connection,
size, &objects, &message);
assert(closure);
wl_closure_invoke(closure, WL_CLOSURE_INVOKE_SERVER, &object, 0, data);
wl_closure_destroy(closure);
}
TEST(connection_marshal_demarshal)
{
struct marshal_data data;
char f[] = "/tmp/wayland-tests-XXXXXX";
setup_marshal_data(&data);
data.value.u = 889911;
marshal_demarshal(&data, (void *) validate_demarshal_u,
12, "u", data.value.u);
data.value.i = -13;
marshal_demarshal(&data, (void *) validate_demarshal_i,
12, "i", data.value.i);
data.value.s = "cookie robots";
marshal_demarshal(&data, (void *) validate_demarshal_s,
28, "s", data.value.s);
data.value.s = "cookie robots";
marshal_demarshal(&data, (void *) validate_demarshal_s,
28, "?s", data.value.s);
data.value.h = mkstemp(f);
assert(data.value.h >= 0);
unlink(f);
marshal_demarshal(&data, (void *) validate_demarshal_h,
8, "h", data.value.h);
data.value.i = wl_fixed_from_double(1234.5678);
marshal_demarshal(&data, (void *) validate_demarshal_f,
12, "f", data.value.i);
data.value.i = wl_fixed_from_double(-90000.2390);
marshal_demarshal(&data, (void *) validate_demarshal_f,
12, "f", data.value.i);
data.value.i = wl_fixed_from_double((1 << 23) - 1 + 0.0941);
marshal_demarshal(&data, (void *) validate_demarshal_f,
12, "f", data.value.i);
release_marshal_data(&data);
}
static void
expected_fail_demarshal(struct marshal_data *data, const char *format,
const uint32_t *msg, int expected_error)
{
struct wl_message message = { "test", format, NULL };
struct wl_closure *closure;
struct wl_map objects;
int size = (msg[1] >> 16);
assert(write(data->s[1], msg, size) == size);
assert(wl_connection_read(data->read_connection) == size);
wl_map_init(&objects, WL_MAP_SERVER_SIDE);
closure = wl_connection_demarshal(data->read_connection,
size, &objects, &message);
assert(closure == NULL);
assert(errno == expected_error);
}
TEST(connection_demarshal_null_strings)
{
struct marshal_data data;
uint32_t msg[3];
setup_marshal_data(&data);
data.value.s = NULL;
msg[0] = 400200; /* object id */
msg[1] = 12 << 16; /* size = 12, opcode = 0 */
msg[2] = 0; /* string length = 0 */
demarshal(&data, "?s", msg, (void *) validate_demarshal_s);
expected_fail_demarshal(&data, "s", msg, EINVAL);
release_marshal_data(&data);
}
/* These tests are verifying that the demarshaling code will gracefully handle
* clients lying about string and array lengths and giving values near
* UINT32_MAX. Before fixes f7fdface and f5b9e3b9 this test would crash on
* 32bit systems.
*/
TEST(connection_demarshal_failures)
{
struct marshal_data data;
unsigned int i;
uint32_t msg[3];
const uint32_t overflowing_values[] = {
/* Values very close to UINT32_MAX. Before f5b9e3b9 these
* would cause integer overflow in DIV_ROUNDUP. */
0xffffffff, 0xfffffffe, 0xfffffffd, 0xfffffffc,
/* Values at various offsets from UINT32_MAX. Before f7fdface
* these would overflow the "p" pointer on 32bit systems,
* effectively subtracting the offset from it. It had good
* chance to cause crash depending on what was stored at that
* offset before "p". */
0xfffff000, 0xffffd000, 0xffffc000, 0xffffb000
};
setup_marshal_data(&data);
/* sender_id, does not matter */
msg[0] = 0;
/* (size << 16 | opcode), opcode is 0, does not matter */
msg[1] = sizeof(msg) << 16;
for (i = 0; i < ARRAY_LENGTH(overflowing_values); i++) {
/* length of the string or array */
msg[2] = overflowing_values[i];
expected_fail_demarshal(&data, "s", msg, EINVAL);
expected_fail_demarshal(&data, "a", msg, EINVAL);
}
release_marshal_data(&data);
}
TEST(connection_marshal_alot)
{
struct marshal_data data;
char f[64];
int i;
setup_marshal_data(&data);
/* We iterate enough to make sure we wrap the circular buffers
* for both regular data an fds. */
for (i = 0; i < 2000; i++) {
strcpy(f, "/tmp/wayland-tests-XXXXXX");
data.value.h = mkstemp(f);
assert(data.value.h >= 0);
unlink(f);
marshal_demarshal(&data, (void *) validate_demarshal_h,
8, "h", data.value.h);
}
release_marshal_data(&data);
}
TEST(connection_marshal_too_big)
{
struct marshal_data data;
char *big_string = malloc(5000);
assert(big_string);
memset(big_string, ' ', 4999);
big_string[4999] = '\0';
setup_marshal_data(&data);
expected_fail_marshal_send(&data, E2BIG, "s", big_string);
release_marshal_data(&data);
free(big_string);
}
static void
marshal_helper(const char *format, void *handler, ...)
{
struct wl_closure *closure;
static struct wl_object sender = { NULL, NULL, 1234 };
struct wl_object object = { NULL, &handler, 0 };
static const int opcode = 4444;
struct wl_message message = { "test", format, NULL };
va_list ap;
int done;
va_start(ap, handler);
closure = wl_closure_vmarshal(&sender, opcode, ap, &message);
va_end(ap);
assert(closure);
done = 0;
wl_closure_invoke(closure, WL_CLOSURE_INVOKE_SERVER, &object, 0, &done);
wl_closure_destroy(closure);
assert(done);
}
static void
suu_handler(void *data, struct wl_object *object,
const char *s, uint32_t u1, uint32_t u2)
{
int *done = data;
assert(strcmp(s, "foo") == 0);
assert(u1 == 500);
assert(u2 == 404040);
*done = 1;
}
TEST(invoke_closure)
{
marshal_helper("suu", suu_handler, "foo", 500, 404040);
}
static void
leak_closure(void)
{
struct wl_callback *cb;
struct pollfd pfd;
struct client *c = client_connect();
cb = wl_display_sync(c->wl_display);
assert(cb);
assert(wl_display_flush(c->wl_display) > 0);
/* we don't need it, it is referenced */
wl_callback_destroy(cb);
pfd.fd = wl_display_get_fd(c->wl_display);
pfd.events = POLLIN;
test_set_timeout(2);
assert(poll(&pfd, 1, -1) == 1);
/* read events, but do not dispatch them */
assert(wl_display_prepare_read(c->wl_display) == 0);
assert(wl_display_read_events(c->wl_display) == 0);
/*
* now we have wl_callback.done and wl_display.delete_id queued;
* if we now release the queue (in wl_display_disconnect())
* we should not leak memory
*/
client_disconnect(c);
}
TEST(closure_leaks)
{
struct display *d = display_create();
client_create_noarg(d, leak_closure);
display_run(d);
display_destroy(d);
}
static void
leak_after_error(void)
{
struct client *c = client_connect();
/* this should return -1, because we'll send error
* from server. */
assert(stop_display(c, 1) == -1);
assert(wl_display_dispatch_pending(c->wl_display) == -1);
assert(wl_display_get_error(c->wl_display) == ENOMEM);
/* after we got error, we have display_resume event
* in the queue. It should be freed in wl_display_disconnect().
* Let's see! */
wl_proxy_destroy((struct wl_proxy *) c->tc);
wl_display_disconnect(c->wl_display);
free(c);
}
TEST(closure_leaks_after_error)
{
struct display *d = display_create();
struct client_info *cl;
cl = client_create_noarg(d, leak_after_error);
display_run(d);
wl_client_post_no_memory(cl->wl_client);
display_resume(d);
display_destroy(d);
}
/** Raw read from socket expecting wl_display.error
*
* \param sockfd The socket to read from.
* \param expected_error The expected wl_display error code.
*
* Reads the socket and manually parses one message, expecting it to be a
* wl_display.error with the wl_display as the originating object.
* Asserts that the received error code is expected_error.
*/
static void
expect_error_recv(int sockfd, uint32_t expected_error)
{
uint32_t buf[1024];
ssize_t slen;
uint32_t opcode;
int str_len;
slen = recv(sockfd, buf, sizeof buf, 0);
assert(slen >= 2 * (ssize_t)sizeof (uint32_t));
opcode = buf[1] & 0xffff;
fprintf(stderr, "Received %zd bytes, object %u, opcode %u\n",
slen, buf[0], opcode);
/* check error event */
assert(buf[0] == 1);
assert(opcode == WL_DISPLAY_ERROR);
str_len = buf[4];
assert(str_len > 0);
assert(str_len <= slen - 5 * (ssize_t)sizeof (uint32_t));
fprintf(stderr, "Error event on object %u, code %u, message \"%*s\"\n",
buf[2], buf[3], str_len, (const char *)&buf[5]);
assert(buf[3] == expected_error);
}
/* A test for https://gitlab.freedesktop.org/wayland/wayland/issues/52
* trying to provoke a read from uninitialized memory in
* wl_connection_demarshal() for sender_id and opcode.
*
* This test might not fail as is even with #52 unfixed, since there is no way
* to detect what happens and the crash with zero size depends on stack content.
* However, running under Valgrind would point out invalid reads and use of
* uninitialized values.
*/
TEST(request_bogus_size)
{
struct wl_display *display;
struct wl_client *client;
int s[2];
uint32_t msg[3];
int bogus_size;
test_set_timeout(1);
/*
* The manufactured message has real size 12. Test all bogus sizes
* smaller than that, and zero as the last one since wl_closure_init
* handles zero specially and having garbage in the stack makes it more
* likely to crash in wl_connection_demarshal.
*/
for (bogus_size = 11; bogus_size >= 0; bogus_size--) {
fprintf(stderr, "* bogus size %d\n", bogus_size);
assert(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, s) == 0);
display = wl_display_create();
assert(display);
client = wl_client_create(display, s[0]);
assert(client);
/* manufacture a request that lies about its size */
msg[0] = 1; /* sender id: wl_display */
msg[1] = (bogus_size << 16) | WL_DISPLAY_SYNC; /* size and opcode */
msg[2] = 2; /* sync argument: new_id for wl_callback */
assert(send(s[1], msg, sizeof msg, 0) == sizeof msg);
wl_event_loop_dispatch(wl_display_get_event_loop(display), 0);
expect_error_recv(s[1], WL_DISPLAY_ERROR_INVALID_METHOD);
/* Do not wl_client_destroy, the error already caused it. */
close(s[1]);
wl_display_destroy(display);
}
}
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